We all know that the Numerical Ability section of the Delhi Police Constable exam is tough, but it is a section where you secure those final marks. If you have analyzed its syllabus, then you must have found a topic named Simple and Compound Interest (SI & CI). You can expect at least 2 to 3 direct questions on calculating interest, principal, or rate. SSC asks these questions to check your ability to handle basic financial math and apply formulas accurately. SI and CI questions are direct checks of formula application. If you master the simple conversion of rate to fractions, you score instantly, securing valuable minutes for other sections. In this blog, we’ve provided exam-level Simple and Compound Interest questions for the Delhi Police Constable exam in a free downloadable PDF.
Concept of Simple and Compound Interest for Delhi Police Constable
Interest is the money earned or paid on a principal amount. Understanding the difference between SI and CI is key:
- Simple Interest (SI): Interest is calculated only on the original principal amount throughout the entire period. It remains constant every year.
- Compound Interest (CI): Interest is calculated on the principal plus the interest accumulated in previous years. It grows faster because you earn interest on interest.
Key Formulas You Must Master
Success in this topic depends entirely on being able to instantly recall and apply these core formulas. Memorize these essentials for the Delhi Police Constable exam:
| Topic Category | Essential Formulas (The Must-Knows) |
|---|---|
| Simple Interest (SI) | SI = (Principal × Rate × Time) / 100 |
| Compound Interest (CI) | Amount (A) = P (1 + R/100)T • CI = A – P |
| Difference (CI – SI) | For 2 Years: P (R/100)2 |
| Doubling Time | For SI: Time = 100 / Rate |
| Effective Rate | For CI (half-yearly/quarterly): Rate = R/n, Time = T × n |
Simple and Compound Interest Questions for Delhi Police Constable PDF, Download for Free
The questions asked by SSC in the Numerical Ability section are typically direct, formula-based problems. They require the quick application of the correct formula and accurate calculation. They are the perfect type of question that can save you time for other time-consuming sections. To help you master these quick facts, we have provided a PDF that consists of the most important and frequently asked SI and CI questions for the exam. Click on the button given below to download the Simple and Compound Interest Questions for Delhi Police Constable PDF for free.
Download Simple and Compound Interest Questions for Delhi Police Constable PDF
A certain sum of money becomes 2.25 times of itself in 2 years. Find the rate of interest if compounded annually.
(a) 25%
(b) 50%
(c) 15%
(d) 75%
A certain sum of money becomes 512/162 times of itself in 4 years. Find the rate of interest if compounded annually.
(a) 33⅓%
(b) 22.22%
(c) 25%
(d) 27.5%
A certain sum of money becomes 625/256 times of itself in 1 year. Find the rate of interest per annum if interest is compounded quarterly.
(a) 25%
(b) 66.66%
(c) 80%
(d) 100%
At what rate per annum will Rs. 4704 amount to Rs. 5766 in 2 years, compounded annually?
(a) 8⅘%
(b) 11⅜%
(c) 12⅐%
(d) 10⅚%
A sum of Rs. 345600 amounts to Rs. 439400 in 3 years. Find the rate of compound interest.
(a) 6⅔%
(b) 8⅓%
(c) 12⅐%
(d) 7⅙%
At what rate per annum will Rs. 48,000 yield a compound interest of Rs. 7,566 in 9 months, compounded quarterly?
(a) 5%
(b) 16%
(c) 20%
(d) 15%
The amounts received at the end of the 2nd year and 3rd year on a certain principal under compound interest are Rs. 9,600 and Rs. 10,272 respectively. What is the rate of interest?
(a) 7%
(b) 8%
(c) 6%
(d) 5%
A certain sum becomes Rs. 54,000 in 4 years and Rs. 59,582 in 7 years. Find the rate of interest if compounded annually.
(a) 5%
(b) 3%
(c) 3⅓%
(d) 6⅔
The effective annual rate of interest corresponding to a compound interest rate of 9% per annum, payable half-yearly, is:
(a) 9%
(b) 9.81%
(c) 9.2025%
(d) 9.333%
A sum of money placed at compound interest triples itself in 8 years. In how many years will it amount to 243 times itself?
(a) 15 years
(b) 40 years
(c) 27 years
(d) 80 years
Download Simple and Compound Interest Questions for Delhi Police Constable PDF
How to Prepare Simple and Compound Interest Questions Easily?
SI and CI are easy score-makers if you follow a dedicated strategy. These tips will help you maximize your problem-solving skills for this topic:
- Master the Fractional Method: For Compound Interest, convert the rate into a fraction (e.g., 10% = 1/10). This makes year-by-year calculation faster than using the complex formula, especially for 2 or 3 years.
- Memorize the 2-Year Difference: Instantly recall the formula for the difference between CI and SI for 2 years (P (R/100)2).
- Know the CI Tree Diagram: Use the tree diagram method to visualize CI for 3 years. It helps break down the interest earned on interest and is faster than the power formula.
- Practice Half/Quarterly Compounding: Always read the question carefully! Remember to divide the Rate and multiply the Time by 2 (for half-yearly) or 4 (for quarterly) before applying the formula.
- Solve High Volume: SI and CI require high repetition to build calculation speed. Solve a dedicated set of 10-20 questions daily using our free topic tests.
Also Read:
- Delhi Police Constable Cut Off
- Delhi Police Constable Syllabus
- Delhi Police Constable Notification 2025
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FAQs: Simple and Compound Interest Questions for Delhi Police Constable
Usually, 2–3 direct SI and CI questions are asked in the Numerical Ability section, focusing on formulas and fast calculation.
SI and CI questions are simple, formula-based, and help you score quickly, saving valuable time for lengthy reasoning or maths questions.
The most important SI formula is: SI = (Principal × Rate × Time) / 100, which is directly asked in most questions.
Use the fractional method or tree diagram to calculate CI quickly instead of applying long formulas, especially for 2–3 years.
Memorize: Difference = P (R/100)², which saves calculation time and avoids long CI formula steps.
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